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  <title>新建一个真彩色图像</title>
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    <li><a href="index.html">PHP Manual</a></li>
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  <div id="layout-content"><div id="function.imagecreatetruecolor" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imagecreatetruecolor</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.6, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">imagecreatetruecolor</span> &mdash; <span class="dc-title">新建一个真彩色图像</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imagecreatetruecolor-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>imagecreatetruecolor</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$width</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$height</code></span>): <span class="type">resource</span></div>

  <p class="para rdfs-comment">
   <span class="function"><strong>imagecreatetruecolor()</strong></span> 返回一个图像标识符，代表了一幅大小为
   <code class="parameter">x_size</code> 和 <code class="parameter">y_size</code> 的黑色图像。
  </p>
  <p class="para">
   是否定义了本函数取决于 PHP 和 GD 的版本。从 PHP 4.0.6 到 4.1.x
   只要加载了 GD 模块本函数一直存在，但是在没有安装 GD2 的时候调用，PHP
   将发出致命错误并退出。在 PHP 4.2.x 中此行为改为发出警告而不是错误。其它版本只在安装了正确的
   GD 版本时定义了本函数。
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.imagecreatetruecolor-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">width</code></dt>

     <dd>

      <p class="para">
       图像宽度。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">height</code></dt>

     <dd>

      <p class="para">
       图像高度。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.imagecreatetruecolor-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">成功后返回图象对象,失败后返回 <strong><code>false</code></strong>。</p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.imagecreatetruecolor-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2660">
    <p><strong>示例 #1 
     新建一个新的 GD 图像流并输出图像
    </strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />header&nbsp;</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-Type:&nbsp;image/png'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$im&nbsp;</span><span style="color: #007700">=&nbsp;@</span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">120</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">20</span><span style="color: #007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;or&nbsp;die(</span><span style="color: #DD0000">'Cannot&nbsp;Initialize&nbsp;new&nbsp;GD&nbsp;image&nbsp;stream'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$text_color&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">233</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">14</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">91</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">,&nbsp;&nbsp;</span><span style="color: #DD0000">'A&nbsp;Simple&nbsp;Text&nbsp;String'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$text_color</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="mediaobject">
     
     <div class="imageobject">
      <img src="images/21009b70229598c6a80eef8b45bf282b-imagecreatetruecolor.png" alt="例子的输出： 新建一个新的 GD 图像流并输出图像" width="120" height="20" />
     </div>
    </div>
   </div>
  </p>
 </div>

 <div class="refsect1 notes" id="refsect1-function.imagecreatetruecolor-notes">
  <h3 class="title">注释</h3>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.imagecreatetruecolor-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.imagedestroy.html" class="function" rel="rdfs-seeAlso">imagedestroy()</a> - 销毁一图像</span></li>
    <li class="member"><span class="function"><a href="function.imagecreate.html" class="function" rel="rdfs-seeAlso">imagecreate()</a> - 新建一个基于调色板的图像</span></li>
   </ul>
  </p>
 </div>

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